All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.710 Pyridazines D011724 +
    D03.383.710.400 Maleic Hydrazide D008300 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.303 Growth Substances D006133 +
   D11.303.760 Plant Growth Regulators D010937 +
    D11.303.760.600 Maleic Hydrazide D008300